supergiant

[n] - an extremely bright star of very large diameter and low density
Found on http://www.webdictionary.co.uk/definition.php?query=supergiant

Supergiant

A star with a higher luminosity and a larger radius than a giant of the same spectral classification. It will have typically one hundred times the luminosity of a giant. It will almost certainly become a supernova. Blue SupergiantA supergiant star with spectral type O or B. Red SupergiantA supergiant with spectral type M. These are the largest star...
Found on http://www.diracdelta.co.uk/science/source/s/u/supergiant/source.html

supergiant

noun an extremely bright star of very large diameter and low density
Found on http://wordnetweb.princeton.edu/perl/webwn?s=supergiant

supergiant

With the exception of hypergiants, the brightest, largest kind of star. Supergiants have luminosities of 10,000 to 100,000 solar luminosities and radii of 20 to several hundred solar radii (about the size of Jupiter's orbit). The two commonest types are red supergiants, exemplified by Betelgeuse and...
Found on http://www.daviddarling.info/encyclopedia/S/supergiant.html

supergiant

Largest and most luminous type of star known, with a diameter of up to 1,000 times that of the Sun. Supergiants are likely to become supernovae
Found on http://www.talktalk.co.uk/reference/encyclopaedia/hutchinson/m0023658.html

Supergiant

Supergiants are among the most massive and most luminous stars. They occupy the top region of the Hertzsprung–Russell diagram with bolometric absolute magnitudes between −5 and −12 and temperatures from about 3,500K to over 20,000K. ==Properties== Supergiants have masses from 8 to 12 times the Sun (M☉) upwards, and luminosities from about ...
Found on http://en.wikipedia.org/wiki/Supergiant

Supergiant

The stage in a star's evolution where the core contracts and the star swells to about five hundreds times its original size. The star's temperature drops, giving it a red color.
Found on http://www.seasky.org/astronomy/astronomy-glossary.html
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